- Killing monsters by whatever means "as a hunter"
- Protecting civilians from harm "to emulate the girl"
- Becoming strong "by himself"
Stack rank and re-order the above, in order of importance.
(If confused, pretend you are in a situation where only higher priority can be achieved, at expense of disregarding lower.)
The answer will come out by itself.
I stand by my point Byoudouin is a high-handed, self-proclaimed "hero". Who goes against the very principles he claims to want to emulate of the girl.